Phase 002: rebrand to hermes-ui and consolidate i18n to zh/en

Removes the ekko / hermes-web-ui branding from the whole tree and drops
eight locale files, so the project presents one name and one language pair.

Data compatibility is deliberate, not accidental: DB filenames, the JWT
audience, and skill manifest ownership all still recognise their pre-rename
values so existing deployments under ~/.hermes-web-ui keep working without a
re-login or a re-injection.

scripts/harness-check.mjs now scans for the legacy strings and fails the
build on any new occurrence, with an explicit allow-list (and reasons) for
the compatibility paths that must keep them.

packages/client/src/views/LoginView.vue

@@ -96,9 +96,9 @@ async function handlePasswordLogin() {
           </template>
           <template v-else>
             <span>{{ t("login.lockResetHint") }}</span>
-            <code>hermes-web-ui clear-login-locks --restart</code>
+            <code>hermes-ui clear-login-locks --restart</code>
             <span>{{ t("login.defaultLoginResetHint") }}</span>
-            <code>hermes-web-ui reset-default-login</code>
+            <code>hermes-ui reset-default-login</code>
           </template>
         </div>
         <button type="submit" class="login-btn" :disabled="loading">

packages/client/src/views/hermes/ChatView.vue

@@ -24,7 +24,7 @@ const routeProfile = computed(() => {
   return typeof value === 'string' && value.trim() ? value : null
 })
 
-const productTitle = 'Hermes Studio'
+const productTitle = 'hermes-ui'
 const tabTitle = computed(() => {
   if (route.name !== 'hermes.session') return productTitle
   return chatStore.activeSession?.title?.trim() || productTitle